"To reach a wider potential market, therefore, the stone will have to be cut," the Deutsche Bank analysts suggest. "That is a complicated task because diamonds are priced exponentially. A 3-carat rock, for example, can cost 10 times more than 1-carat sparklers."

Notably, that's sort of what happened to the biggest diamond ever, "the 3,106-carat Cullinan," which was found near Pretoria in South Africa in 1905: It was cut up and turned into the Great Star of Africa and the Lesser Star of Africa, which are set in the crown jewels of Britain.